-Work is always still open to scrutiny from outside sources Precision -Use smaller increments on measuring equipment(where appropriate)

-Reduces percentage error

error/ value= +/- maximum error Plotting graphs -If both independent and dependent are continous data, use a dot plot line graph-If one or more of variables is catagoric, use a bar chart-If independent variables can not be interconnected, seperate out bar's from one another Examples:-Placebo use (control group)-Double blind trial-Ensuring all are treated the same-Large samples to mitigate anomalous results

-Evaluation Accuracy Get another body to do same test independentlyand compare results

Do test in a different way and compare the results Variables independent dependent control Evaluation value for each measured change in the independent variable variable changed by investigator control variables - must be kept constant for all tests in experiment -if not kept constant, will effect/ bias the results of the experiment -errors resulting from a failure to control certain variables can be noted as:-systematic errors-zero errors(-random errors) How could test have been improved:-reliability-precision-accuracy